9 files changed, 40 insertions, 20 deletions
diff --git a/src/Blocks/BlockBigFlower.h b/src/Blocks/BlockBigFlower.h
index 3b3065f87..96139d656 100644
--- a/src/Blocks/BlockBigFlower.h
+++ b/src/Blocks/BlockBigFlower.h
@@ -18,19 +18,39 @@ public:
 	{
 	}
 
-	virtual bool DoesIgnoreBuildCollision(cPlayer * a_Player, NIBBLETYPE a_Meta) override
+	virtual bool DoesIgnoreBuildCollision(cChunkInterface & a_ChunkInterface, Vector3i a_Pos, cPlayer & a_Player, NIBBLETYPE a_Meta) override
 	{
-		return (((a_Meta & E_META_BIG_FLOWER_DOUBLE_TALL_GRASS) != 0) || (a_Meta & E_META_BIG_FLOWER_LARGE_FERN) != 0);
+		if (IsMetaTopPart(a_Meta))
+		{
+			BLOCKTYPE BottomType;
+			if (
+				(a_Pos.y < 1) ||
+				!a_ChunkInterface.GetBlockTypeMeta(a_Pos.x, a_Pos.y - 1, a_Pos.z, BottomType, a_Meta) ||
+				(BottomType != E_BLOCK_BIG_FLOWER)
+			)
+			{
+				// Can't find the flower meta so assume grass
+				return true;
+			}
+		}
+
+		NIBBLETYPE FlowerMeta = a_Meta & 0x07;
+		return (
+			(FlowerMeta == E_META_BIG_FLOWER_DOUBLE_TALL_GRASS) ||
+			(FlowerMeta == E_META_BIG_FLOWER_LARGE_FERN)
+		);
 	}
 
 	virtual void DropBlock(cChunkInterface & a_ChunkInterface, cWorldInterface & a_WorldInterface, cBlockPluginInterface & a_BlockPluginInterface, cEntity * a_Digger, int a_BlockX, int a_BlockY, int a_BlockZ, bool a_CanDrop) override
 	{
 		NIBBLETYPE Meta = a_ChunkInterface.GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ);
 		int AlternateY  = a_BlockY;
+		int BottomY     = a_BlockY;
 
 		if (Meta & 0x8)
 		{
 			--AlternateY;
+			--BottomY;
 		}
 		else
 		{
@@ -39,13 +59,18 @@ public:
 		// also destroy the other block if it has a valid height and is a big flower
 		if (cChunkDef::IsValidHeight(AlternateY) && a_ChunkInterface.GetBlock(a_BlockX, AlternateY, a_BlockZ) == E_BLOCK_BIG_FLOWER)
 		{
-			super::DropBlock(a_ChunkInterface, a_WorldInterface, a_BlockPluginInterface, a_Digger, a_BlockX, a_BlockY, a_BlockZ, a_CanDrop);
+			super::DropBlock(a_ChunkInterface, a_WorldInterface, a_BlockPluginInterface, a_Digger, a_BlockX, BottomY, a_BlockZ, a_CanDrop);
 			a_ChunkInterface.FastSetBlock(a_BlockX, AlternateY, a_BlockZ, E_BLOCK_AIR, 0);
 		}
 	}
 
 	virtual void ConvertToPickups(cItems & a_Pickups, NIBBLETYPE a_BlockMeta) override
 	{
+		if (IsMetaTopPart(a_BlockMeta))
+		{
+			return;  // No way to tell flower type
+		}
+
 		NIBBLETYPE Meta = a_BlockMeta & 0x7;
 		if (Meta == E_META_BIG_FLOWER_DOUBLE_TALL_GRASS)
 		{
diff --git a/src/Blocks/BlockDeadBush.h b/src/Blocks/BlockDeadBush.h
index f9ce9a9ff..799d3a2f2 100644
--- a/src/Blocks/BlockDeadBush.h
+++ b/src/Blocks/BlockDeadBush.h
@@ -17,7 +17,7 @@ public:
 	{
 	}
 
-	virtual bool DoesIgnoreBuildCollision(void) override
+	virtual bool DoesIgnoreBuildCollision(cChunkInterface & a_ChunkInterface, Vector3i a_Pos, cPlayer & a_Player, NIBBLETYPE a_Meta) override
 	{
 		return true;
 	}
diff --git a/src/Blocks/BlockFire.h b/src/Blocks/BlockFire.h
index 346167a26..f16347558 100644
--- a/src/Blocks/BlockFire.h
+++ b/src/Blocks/BlockFire.h
@@ -232,7 +232,7 @@ public:
 		return (FoundFrameZP && FoundFrameZM);
 	}
 
-	virtual bool DoesIgnoreBuildCollision(cPlayer * a_Player, NIBBLETYPE a_Meta) override
+	virtual bool DoesIgnoreBuildCollision(cChunkInterface & a_ChunkInterface, Vector3i a_Pos, cPlayer & a_Player, NIBBLETYPE a_Meta) override
 	{
 		return true;
 	}
diff --git a/src/Blocks/BlockFluid.h b/src/Blocks/BlockFluid.h
index 0a8b34145..c33427739 100644
--- a/src/Blocks/BlockFluid.h
+++ b/src/Blocks/BlockFluid.h
@@ -24,7 +24,7 @@ public:
 		// No pickups
 	}
 
-	virtual bool DoesIgnoreBuildCollision(void) override
+	virtual bool DoesIgnoreBuildCollision(cChunkInterface & a_ChunkInterface, Vector3i a_Pos, cPlayer & a_Player, NIBBLETYPE a_Meta) override
 	{
 		return true;
 	}
diff --git a/src/Blocks/BlockHandler.cpp b/src/Blocks/BlockHandler.cpp
index 41e3561d1..40cc6b492 100644
--- a/src/Blocks/BlockHandler.cpp
+++ b/src/Blocks/BlockHandler.cpp
@@ -582,7 +582,7 @@ bool cBlockHandler::IsClickedThrough(void)
 
 
 
-bool cBlockHandler::DoesIgnoreBuildCollision(void)
+bool cBlockHandler::DoesIgnoreBuildCollision(cChunkInterface & a_ChunkInterface, Vector3i a_Pos, cPlayer & a_Player, NIBBLETYPE a_Meta)
 {
 	return (m_BlockType == E_BLOCK_AIR);
 }
diff --git a/src/Blocks/BlockHandler.h b/src/Blocks/BlockHandler.h
index 625def7d8..302fdbc4b 100644
--- a/src/Blocks/BlockHandler.h
+++ b/src/Blocks/BlockHandler.h
@@ -114,16 +114,11 @@ public:
 
 	/** Checks if the player can build "inside" this block.
 	For example blocks placed "on" snow will be placed at the same position. So: Snow ignores Build collision
+	@param a_Pos Position of the block
+	@param a_Player Player trying to build on the block
+	@param a_Meta Meta value of the block currently at a_Pos
 	*/
-	virtual bool DoesIgnoreBuildCollision(void);
-
-	/** Similar to DoesIgnoreBuildCollision(void), but is used for cases where block's meta or
-	player's item-in-hand is needed to determine collision (thin snow) */
-	virtual bool DoesIgnoreBuildCollision(cPlayer *, NIBBLETYPE a_Meta)
-	{
-		UNUSED(a_Meta);
-		return DoesIgnoreBuildCollision();
-	}
+	virtual bool DoesIgnoreBuildCollision(cChunkInterface & ChunkInterface, Vector3i a_Pos, cPlayer & a_Player, NIBBLETYPE a_Meta);
 
 	/** Returns if this block drops if it gets destroyed by an unsuitable situation.
 	Default: true */
diff --git a/src/Blocks/BlockSnow.h b/src/Blocks/BlockSnow.h
index d11c444b9..a502d82e4 100644
--- a/src/Blocks/BlockSnow.h
+++ b/src/Blocks/BlockSnow.h
@@ -41,9 +41,9 @@ public:
 		return true;
 	}
 
-	virtual bool DoesIgnoreBuildCollision(cPlayer * a_Player, NIBBLETYPE a_Meta) override
+	virtual bool DoesIgnoreBuildCollision(cChunkInterface & a_ChunkInterface, Vector3i a_Pos, cPlayer & a_Player, NIBBLETYPE a_Meta) override
 	{
-		if ((a_Player->GetEquippedItem().m_ItemType == E_BLOCK_SNOW) && (a_Meta < 7))
+		if ((a_Player.GetEquippedItem().m_ItemType == E_BLOCK_SNOW) && (a_Meta < 7))
 		{
 			return true;  // If a player is holding a (thin) snow block and it's size can be increased, return collision ignored
 		}
diff --git a/src/Blocks/BlockTallGrass.h b/src/Blocks/BlockTallGrass.h
index fb65bca65..8920bd7c9 100644
--- a/src/Blocks/BlockTallGrass.h
+++ b/src/Blocks/BlockTallGrass.h
@@ -18,7 +18,7 @@ public:
 	{
 	}
 
-	virtual bool DoesIgnoreBuildCollision(void) override
+	virtual bool DoesIgnoreBuildCollision(cChunkInterface & a_ChunkInterface, Vector3i a_Pos, cPlayer & a_Player, NIBBLETYPE a_Meta) override
 	{
 		return true;
 	}
diff --git a/src/Blocks/BlockVine.h b/src/Blocks/BlockVine.h
index 755161b12..a015c8ab3 100644
--- a/src/Blocks/BlockVine.h
+++ b/src/Blocks/BlockVine.h
@@ -163,7 +163,7 @@ public:
 		}
 	}
 
-	virtual bool DoesIgnoreBuildCollision(void) override
+	virtual bool DoesIgnoreBuildCollision(cChunkInterface & a_ChunkInterface, Vector3i a_Pos, cPlayer & a_Player, NIBBLETYPE a_Meta) override
 	{
 		return true;
 	}